A transportation company's ships are being robbed regularly, but only when they are carrying large amounts of money and credits. Commander Corry suspects that the ship's captain is stealing the money from his own ships and blaming a mysterious gang of space pirates to cover his tracks. Corry orders Happy to stow away on the spaceship and await developments, not realizing that the crooked captain has an informant working in Space Patrol's secret code section and passing along crucial information to the criminals. (thetvdb.com)